*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00001010
Feb001034
Mar007007
Apr01536200377
May29208457009667
Jun7195102630019780
Jul3170501988009069
Aug1051017001032
Sep031824001827
Oct1360100605
Nov01150016
Dec001003646
Total5135795654504942440